Doorcheck



Nov. z2., v1932. J.. A. HQSIERS DooRcHEcK Filed Dec. 22, 1951 IIIIII'III lll ...I l

lNvENToR Jw Ah'. S/fs'.

WM', Has ToRN Ys Patented Nov. 2,2.,V 1932 UNITED STATES JOHN A. H.sums, or JERSEY CITY, NEWJEiisnizcrI DOOBCHECK Y, .d

Application mea December 2 2; i931. seria1N0-5s2-,54a'

This invention relates to devices for producing a spring action to closea door, and also a device provided with an air cushion to prevent theslammingof a door when it is 5 being closed.

The object of the present invention'is to y produce a door check whichis simple in construction, easy to manufacture and install,

and one that. will be durable, smooth in action, and .onethat does notrequire a contained liquid tocontrol its action. Y

For a detailed description of one form of my invention, which I atpresent deem preferable, reference may be had to the'follow- -1 Fig. 4is a plan view of the door check, as

installed. g

Referring to Fig. 1, the numeral 1 indicates an outer substantiallycylindrical casing having the cap 2 for the upper end thereof, `andprovided with downwardly project,

ing tapering lugs 3, which engage off-sets 5 forming stops on ltheinterior of the plunger 5, preventing the latter from turning with thespindle 11. The cap 2 is also provided with an opening 4 through whichthe air may enter and escape. The plunger 5 is provided with a centraltubular portion 6, provided with screw threads 7 of comparatively steeppitch, as indicated in Fig. 3. The plunger 5 may be provided withpacking vrings 8 if desired. Surrounding the tubular portion 6 of thelplunger 5 is a helical compression spring 9, the top of which Vcontactswith the cap 2 andthe bottom of whichrests on the inner surface of theend of the plunger 5..

The screw threaded portion 7 on the tubular portion 6 of the plunger 5is adapted to engage corresponding screw threads V10 on a centralspindle 11. Said spindle has a bearing in the cap 2 and projects abovethe 'same pivoted at 14 to the 'door casin v .The casing 1 is afhXedtothe-door inA'any- A suitable way,`such asby screwing theears 16 so'thatlit may be allirxed to a suitablelever\4 12', which lispivoted to anadjustable/con- ATENT oFFIcfj i `necting rod 13, the outerendfofwhichyqisalso l to the door itself. Theflowerend ofthe outercasingl .is providedV with aneedle-valve or similar device 17, by the;Iadjustment. of Y which theescape of air 'from-thefspace be-A tween theplunger 5 and the lower end of the casing lmay'be regulated@-Saidendrofthe i i casing A1` is also providedwithl a .checklvalve l8made in anysuitable way, such ,as

It will thus be seen that whenthe door is being opened the lever 12 willv cause the spin'- bypI'O- viding a ball 19 held in position by spring20.11.'

dle 11 to'rotate on its` axisfor a-distanjcefof 18,0 degrees, more vorless; This ywillcause kthe j 4screw threads 10 to draw the tubularportion 6 ofthe plungerl 5 upward, and also will compress 'l the spring9. When the door` has reached theglimit of its opening movement, andreleased, the spring -9 will force'v the plunger 5. downwardand socompress the ,airv in the space betweenzthe endof saidwplunger and` theend of the .casing 1. ThiscompressionQof theair` will force air ,outwardthrough `the passage leading 'to and past `the needleyvalve 17,andtherapidity of the passage. of;

said air and the-rapidity of the lclosing of said` door will be'controlled by the position of the i fscrew member of the needle-valve'17.. .The door will thus be `caused yto shutslowlyand quietly as thezframe of thegdoorapproaches ,the door casing, and any'slammingactionwill `thereby Abe prevented. When .thedoo'r is..

again opened the plunger will again be drawn upward andthe air allowed.yto enter the end v of the casing l through theV checkvalve.18.:A

f It will vbe noticedl .that the action of'my Vimproved door checkdependspractically upon only two moving parts, that is, parts vconstituting the screw threaded: spindle 10 and thescrew threaded tubey6..V The screw?- threads may be made to accuratelyV fit each other, buton the other hand anyV considerable wear by constant opening and closingof the door will not materially affect, the action of the device as awhole. There are therefore`7 practically no parts to beco al, thusassuring Y ters Patent is:

slidableplungertherein,afspringwithinvfsaid y -casing f-or pro20er/nain,

for .rotating Y the door.

c Aer, alhelicalcornpression spring surrounding fi casing having a space*casing-having a space either when itlie door is being opened orY whenthefspring is causing the closing action by producing `arotation ofthespindlell. u What I claim anddesire to protect byLe't- 1; A pneumaticforming anV air chamber at the lower end thereof,r a longitudinallyducing a pressure rupon said plunger, a screw threaded spindle engagingsaid' plunger for movingthe same longituvmeans connected with saidspindle cheekxduring-opening and closing motions of 'f' 2fAr'pneumatic'kdoor ycheck comprising,a

r4-a't (the vlower end thereof, a longitudinally .s'lidablerecessed'plunger therein, an interior- .lyf screw-threaded -tube c arried bysaid plung- -saiditube withinv said recess and bearingV din "rectly onsaidfplungerto force the latter --downward,-:a spindle. having' `steep,vscrew `threads thereon and engagin'gfsaid. screwl jthreadedmbe, a

v,spindlefior:rotating the-samebyrelative-nioi *,-l'm'emberwithinsaid-plunger and ybearingdilre'ctly onqsaid'plunger' to forcevrthe flatter Y' downward, a rotatable member vhaving screw i threadsthereon and engaging saidjfirst'screw` lever 'connected with said 'tionbetween the door landits casingfand Y valvesin the'wall ofsaid-casinglfor controln Y`ling" the owof external' air Vinto and out of,l

said casing. s s

` 133. A lpneumatic vdoor :check comprising, la

fcasing havlng a space'formlnganairchamber atfthe lowery endthereohaninteriorly screw- "threaded member carried said plunger, '1 alrhelical compression spring. surrounding said threadedmember, a leverconnected with said spindle for rotatingithesame, stops onsaid plunger,downward projections onV the top of 055^said casingiadaptedto Contactwith'said stops "'.to preventrotation ofsaid plunger, and valves,foricontrollingfthe'flow of external airinto 60 Y "Signed this 19th andout ofsaid casing, respectively.

day of December, 1931. yJOHN A.- H. SIERS;

1,see,543

door check comprising, a v

y thesame by relative motionbeyftween aV door audits casing,v and valvesinl Fthewall of .said casing for controlling the lowoffexternal airintoand out loilthefdoor forming an archamber

